Check the filters are clean

If the filters or any hoses or pipes become blocked the product may become noisier than usual. There may be a spluttering noise which is a safety valve operating to protect the cleaner when the air flow is restricted by a blockage.

If you feel the product is making more noise than normal remove and clean the dust box and filters, or replace the paper bag (where fitted). Check pipe work/ hoses and the tools to check they are not  blocked.